Developing tank



1,445,046. P. W. .SMITH.

4 DEVELOPING TANK. HLD JULY 8 1922 INVENTOR. PHm \Mfimifh Arm Feb. 13, 1923.

Patented Feh. l3,

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rant

nnvnnorme TANK.

lippfication filed July 8, 1922. Serial no. 573531."

T 0 all whom it may concern:

Be it known that I. Ppinr W. SMITH, a citizenot he United States of America, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and use'iul Improvements in Developing Tanks, 0. which the following is a specification.

Elie object of this invention'is to provide a new and improved form of developing tank which is especially adapted for developing and fixing dental X-ray films. These tanks are made so that they will use a minimum amount or" developing or fixing solution and are intended to be partially immersed. in a bath of water having a predetermined temperature.

Another object of this invention is to pro; vide means whereby two of these tanks can be connected together with one 00 iningthe developing solution and the other the fixing solution so that both of these tanks can be simultaneously rocked in the water bath, keeping the solutionin both of the tanks in constant motion.

These and other objects of this invention will be fully illustratedin the drawing, described in the specification and pointed out in the claims at the end thereof.

In the accompanying drawing:

Figure 1 is a perspective view of a pair of these tanks as they appear when connected together and placed in the water bath, the tank containing the water bath being shown in section to better illustrate the sup-- porting member mounting of the tanks containing the developing and fixing solution.

Figure 2 is a perspective view oi? a simillll' pair oi? tanks placed in, the water bath showing a modified form of connection between the tanks as well as modified support oi the tanks in the water bath. v

Figure is a vertical sectional view 01? the tanks, the section being taken on the line 3 3 of Figure 1.

Figure 4 is a detailsectional view of one of the clamps for fastening the tanks to the connecting member, the section being taken on the line L l of Figure 3.

Figure 5 is a detail sectional view of the connecting clip used in connection with the form of support illustrated in Figure 2. the section being taken on the. line Feof Figure 2.

Figure 6 is a detail view of the clip with which the tank is fastened to the rocking member. i I i in the several figures oi the drawing like reference numerals indicate like parts.

In the developing of and fixing of dental Xaay films a minimum amount of solution is used. For this reason the tanks in which these films are developed and fixedare made long and high and narrow. Inorder to get the best results it is necessary to keep the developing and fixing solution at an even temperature and for this reason these long and high and narrow developing and fixing tanks are placed in a larger tank containing a correspondingly larger volume of water. The water in this tank serves to keep the developing and fixing solution at a corresponding temperature and. by regulating the temperature of the water in thetank the temperature of the solutions in the smaller tanks is kept at the desired point.

In my present invention I have provided i 'ineans whereby two of the tanks can'be connected together and mounted on a single rocking member so that the X-ray films can be developed in one of the tanks and then lined in the other of the tanks while both of the tanks are simultaneously; rocked 'in the water bath by the operator in order to keep the solutions therein in motion.

In the preferred form of mounting illustrated in Figure 1' each of the tanks 1 has a clip 9. fastened to the middle of the bottom thereof. F or this "purpose suitable lugs 3 may be provided on the sides of the tanks between which the clip can straddle the tank as illustrated in Figures 1 and 3. The clips may be made so that they spring in place between the lugs and grip the tank so that with the aid of the lugs they will hold themselves in place thereon. Tlhe clips may also be soldered or otherwise fastened to the tank "in which case the lugs 3 may be omitted from the construction of the tank.

' Each of the clips 2 ism'ade up in the shape of a short and shallow channel in which the tank proper is adapted to rest. The bottom of the. channel forming the'clip has the pair 01- angularflanges land 5 struck up thereon forming a triangular socket into which is inserted the triangular rod 6. This rod is made long enough so that two oi the clips-2 and their tanks can be temperature fot the developing and fixing t-OllllllOllS 1n the tanks 1 is correspoudiug y supported thereon. In this way two and if desired more of thesetanks can be connected together and placed in a larger water tank.

tanks stability and holds them in an upright position in the larger water tank 7. The rod (3 also serves as a rocker for the tanks so connectedtoiia'h they tank, The so that the lowered and kept at thistemperature (llllil the developing and fixing of the ne f In this way thedevelopment and the liking of the negatives is secured-under the best conditions while the shape and sir/re of the tank secures the development and lining wlth the least amount of developing and fixing solution.

While developing and lining negatives in the tanks 1 these tanks are rocked back and forth on the rod 6. The triangular edge of this rod on which the tanks are supported forms an ideal rocking bearing on which the tanks can be easily rocked. T he triangular crosssection of the rod and its engagement with thetriangular socket formed on the clip 2 also serves to hold the two tanks parallel to each other Without any other fastening means between them. ll hile I have shown the rod 6 as triangular in cross section, it is understood that any other rod having an angular or rounded edge that can serve as a rocking bearing may be used instead. I

In Figure 2 I have illustrated a modified form of the connection between a pair of the tanks 1 and the rocking member for supportin the same. In this form the two tanks are neld together by means at a clip 10 which is slipped over the top edge oi. the

two adjacent sides of the tanks to clamp them together and. hold them parallel. to each other. The tanks are supported in the water tank on a cradle 11 which is made up by two triangular frames that are connected together at the bottom by the cross bar 12. The cross bar 12 is adapted to support the tanks so that they can be rocked back and forth thereon in the same manner The connecting triangular rod 6' which connects the tanks it together gives the in which the tanks are rocked on the rod 6.

l claim:

ln tank for developing and fixing negatives, the combination of alarge tank. a pair of smaller tanks mounted within said larger tank, rocking member supporting said smaller tanks within said larger tanks and means for fastening said smaller tanks to said roe" 'ng member to make them rock in un'son with said'rocking member.

In a tank for developing and fixing r 'atives, the combination of a larger outer and a small innertank mountedavithin larger tank, a rocking member supporting said inner tank, fastening means carried by said inner tank .to engage said rocking men' ber to lock said rockin member to said inner tank.

3. In a tank for developing and fixing negatives, the fcombiuatiou of a large outer tank and a small inner tank mounted within said larger tank, a socket member carried n the bottom of said inner tank, airockmg member adapted to make engagement wlth said socket member and form a stationary rocking bearing on the bottom of said smaller tank.

4. In a tank for developing and fixing negatives, the combination of a. large outer tank and a pair of smaller tanks mounted within said larger tank, locking means for locking said pair of smaller tanks together and a rocking member mounted within said larger tank to support said smaller tanks and allow said pair of tanks to rock in unison within said larger tank.

5. In a tank for developing and fixing negatives, thecombination of a large outer tank and a pair of small inner tanks, sockets formed on the bottom of each of said smaller tanks, a connecting member adapted to iengage said sockets on said smaller tanks and connect said. tankstogether, a rocking bearing formed on said connecting member on which said smaller tanks are adapted to EI'OCk Within said larger tank.

6. ln a. tank for developing and fixing negatives, the combination of a large outer tank and small iinner tank, a. clip attached to the bottom at said smaller tank, a socket member termed on said clip and a rocking member adapted to engage into said socket member to form a rocking bearing tor said smaller tank.

ln testimony whereof I atlix my signature.

PLINY W. SMITH. 

